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Re: [Condor-users] sharing cpu performance

Dear Ian,

Thanks a lot for the detailed answer. Condor automatically defines 8 slots in my system and I thought if I define 4 slots and divide cpu performance into 4 in my configuration, I can double the performance of each slot. You are right, I am using single threaded jobs in my system.


On 25/11/11, Ian Chesal <ichesal@xxxxxxxxxxxxxxxxxx> wrote:
On Thursday, 24 November, 2011 at 4:01 AM, D.Yilmaz wrote:
I have 2 processor, quad core system and I see total 8 processors in my system.
I wanted to share the total cpu performance to the 4 condor slot and I put the following two lines in my condor configuration.

SLOT_TYPE_1 = cpus=25%

When I checked the performance of the system with top command I see condor is only using the for 4 cores of the total system other 4 cores looks idle. Could you tell me what's wrong?
Condor doesn't parallelize your underlying work load. If you have 4 slots advertised, on an 8 core machine, but then submit 4 jobs that are all single threaded…you'll only see 4 of the 8 cores in use on the box. Condor can't help you out with that.

Unless you've told Condor to explicitly lock jobs to specific cores, I suspect the problem is you're running single threaded/process work loads via Condor, not multithreaded or multiprocess.

- Ian
Ian Chesal

Cycle Computing, LLC
Leader in Open Compute Solutions for Clouds, Servers, and Desktops
Enterprise Condor Support and Management Tools